紫铜材料齿条冷滚打金属变形行为研究

摘要

In this paper,the principle of rack cold roll-beating is analyzed,the FEA model is built, and the stress and stain evolution are analyzed.The cold roll-beating experiments are carried out, the microstructure and hardness distribution are analyzed emphatically to study the law of metal flow and the product microstructure performance in the cold roll-beating process.The results show that the rack cold roll-beating technology not only can avoid the decrease of strength due to the cut off of metal fiber,but also can improve the surface strength due to the cold plastic de-formation,and it is a very promising technology.%分析了齿条高速冷滚打成形原理，在ABAQUS中建立齿条冷滚打有限元模型，由于塑性应变的大小代表着金属的流动情况，重点对成形过程的应力应变变化情况进行了仿真分析。在改造的冷滚打设备上进行齿条冷滚打试验，对滚打后材料的金属纤维组织和硬度变化进行分析，以研究齿条冷滚打塑性成形过程中金属的流动规律和成形制件组织性能。研究结果表明，齿条冷滚打过程中，金属组织未被切断，晶粒得到破碎和细化，最终被滚压成纤维组织；冷滚打工艺有效地改善了金属表面的金相组织，使工件硬度和强度有较大提高，是一种非常有前景的精密塑性成形技术。